168683609 has 2 divisors, whose sum is σ = 168683610. Its totient is φ = 168683608.

The previous prime is 168683573. The next prime is 168683621. The reversal of 168683609 is 906386861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137992009 + 30691600 = 11747^2 + 5540^2 .

It is a cyclic number.

It is not a de Polignac number, because 168683609 - 2⁸ = 168683353 is a prime.

It is not a weakly prime, because it can be changed into another prime (168682609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84341804 + 84341805.

It is an arithmetic number, because the mean of its divisors is an integer number (84341805).

Almost surely, 2^168683609 is an apocalyptic number.

It is an amenable number.

168683609 is a deficient number, since it is larger than the sum of its proper divisors (1).

168683609 is an equidigital number, since it uses as much as digits as its factorization.

168683609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 168683609 is about 12987.8254145950. The cubic root of 168683609 is about 552.5322452055.

The spelling of 168683609 in words is "one hundred sixty-eight million, six hundred eighty-three thousand, six hundred nine".